Lithium batteries has become the generic word for "internal backup batteries". It may or may not actually be lithium based. Whatever it is, a reputable GPS manufacturer should be using batteries with an operating life of 4 to 7 years. Typically, this battery is soldered to the main receiver board and is not user replacable. In addition to saving your waypoints, last position, setup data (knots vs MPH etc.) the battery saves GPS almanac data. When you turn the GPS on it looks at your old almanac data and does a sky search based upon where it thinks it is. If you havn't moved more than 100 miles or so from the position that it last had, and your almanac is less than 30 days old, you usually get a fix within a minute. If the battery dies and the GPS can't retain data, you may see a 20-60 minute delay before it can start giving you position. Any battery guages are relative readings of the main operating batteries. There is really no way to check your internal backup battery. So much for science.... It is kinda fun to run a couple types of navigation simultaneously ie. compass/chart/DR/GPS. Really feels good when all solutions work out properly. Thats real navigating! TM *************************************************************************** PaddleWise Paddling Mailing List Submissions: paddlewise_at_lists.intelenet.net Subscriptions: paddlewise-request_at_lists.intelenet.net Website: http://www.gasp-seakayak.net/paddlewise/ ***************************************************************************Received on Fri May 22 1998 - 19:38:53 PDT
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